subject_56624.htm

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序号：56624 发表者：zhangfeng 发表日期：2003-10-19 15:33:42
<br>主题：菜鸟问题：我copy了一段directshow的代码，然后为什么不能播放出图象来，只有声音，而且是死循环的。
<br>内容：代码片段<BR>HRESULT DShow::Play(IDirectDrawSurface *pSurface, IMultiMediaStream *pMMStream)<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;IMediaStream *pPrimaryVidStream; <BR>IDirectDrawMediaStream *pDDStream; <BR>IDirectDrawStreamSample *pSample; <BR>RECT rect; <BR>DDSURFACEDESC ddsd; <BR><BR>pMMStream-&gt;GetMediaStream(MSPID_PrimaryVideo, &amp;pPrimaryVidStream); <BR>pPrimaryVidStream-&gt;QueryInterface(IID_IDirectDrawMediaStream, (void **) <BR>&amp;pDDStream); <BR>ddsd.dwSize = sizeof(ddsd); <BR>pDDStream-&gt;GetFormat(&amp;ddsd, NULL, NULL, NULL); <BR><BR>rect.top =100; <BR>rect.left =150; <BR>rect.bottom = ddsd.dwHeight+100; <BR>rect.right = ddsd.dwWidth+150; <BR><BR>pDDStream-&gt;CreateSample(pSurface, &amp;rect, 0, &amp;pSample); <BR>pMMStream-&gt;SetState(STREAMSTATE_RUN); <BR><BR>while (pSample-&gt;Update(0, NULL, NULL, NULL) == S_OK);&nbsp;&nbsp;<BR>//就是在这里死住了！<BR><BR>pMMStream-&gt;SetState(STREAMSTATE_STOP); <BR>pSample-&gt;Release(); <BR>pDDStream-&gt;Release(); <BR>pPrimaryVidStream-&gt;Release(); <BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;return E_NOTIMPL;<BR>}<BR>还有，就是关于播放不出图象来的，是不是在directdraw中的<BR>if(FAILED(r=pDD-&gt;SetCooperativeLevel(hwnd, <BR>DDSCL_EXCLUSIVE|DDSCL_FULLSCREEN))) <BR>我不知道怎么样获得个对话框的hwnd，然后我就将第一个参数写了null。<BR><BR>
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<font color=red>答案被接受</font><br>回复者：hua_soft 回复日期：2003-12-24 09:39:12
<br>内容：你可以先定义一个全局的HWND 变量,在对话框的初始化过程中把this-&gt;m_hWnd的值赋给它
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